/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package gov.nasa.ensemble.common.ui.ide.navigator;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IResource;

public class ResourceExistsPropertyTester extends PropertyTester {

	/**
	 * A property indicating whether the file exists (value
	 * <code>"exists"</code>).
	 */
	public static final String EXISTS = "exists"; //$NON-NLS-1$
	
	@Override
	public boolean test(Object receiver, String property, Object[] args,
			Object expectedValue) {
		IResource resource = (IResource)receiver;
		if (EXISTS.equalsIgnoreCase(property)) {
			return resource.exists() == (Boolean)expectedValue;
		}
		return false;
	}

}
